• Title/Summary/Keyword: System combination

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Feature Combination and Selection Using Genetic Algorithm for Character Recognition (유전 알고리즘을 이용한 특징 결합과 선택)

  • Lee Jin-Seon
    • The Journal of the Korea Contents Association
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    • v.5 no.5
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    • pp.152-158
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    • 2005
  • By using a combination of different feature sets extracted from input character patterns, we can improve the character recognition system performance. To reduce the dimensionality of the combined feature vector, we conduct the feature selection. This paper proposes a general framework for the feature combination and selection for character recognition problems. It also presents a specific design for the handwritten numeral recognition. Tn the design, DDD and AGD feature sets are extracted from handwritten numeral patterns, and a genetic algorithm is used for the feature selection. Experimental result showed a significant accuracy improvement by about 0.7% for the CENPARMI handwrittennumeral database.

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Nonlinear Oscillation Characteristics in Combination Resonance Region Considering Damping Effects (조합공진 영역에서 감쇠의 영향을 고려한 비선형 진동 응답 특성)

  • Jeong, Tae-Gun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.9
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    • pp.849-855
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    • 2010
  • Damping may change the response characteristics of nonlinear oscillations due to the parametric excitation of a thin cantilever beam. When the natural frequencies of the first bending and torsional modes are of the same order of magnitude, we can observe the one-to-one combination resonance in the perturbation analysis depending on the characteristic parameters. The nonlinear behavior about the combination resonance reveals a chaotic motion depending on the natural frequencies and damping ratio. We can analyze the chaotic dynamics by using the eigenvalue analysis of the perturbed components. In this paper, we derived the equations for autonomous system and solved them to obtain the characteristic equation. The stability analysis was carried out by examining the eigenvalues. Numerical integration gave the physical behavior of each mode for given parameters.

A Study on System Optimization according to the Supply Obligations Rate of New and Renewable Energy at an Indoor Gymnasium (실내체육관의 신재생에너지 공급의무비율에 따른 시스템 최적화 연구)

  • Park, Yun-Ha;Kim, Yun-Ho;Won, An-Na;Hwang, Jung-Ha
    • Journal of the Korean Solar Energy Society
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    • v.35 no.6
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    • pp.51-60
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    • 2015
  • In statutes on the promotion of distribution of new and renewable energy, which were revised in 2014, daylight system and fuel cell were added in addition to existing new and renewable energy sources. This study, therefore, aimed at setting up targets for the introduction of daylight system and analyzing the installation rate of new and renewable energy which can be provided by daylight system for the aggressive use of daylight system, thereby deducting the optimal combination ratio with other new and renewable energy sources. The results of the study are as follows. First, when a prism-shaped daylight system was installed to a round indoor gymnasium among domestic indoor gymnasiums, out of a supply obligations allotment rate of 15% of new and renewable energy, the rate of daylight system was basically set at 2.5%. Second, therefore, with daylight system coming first, the lacked supply obligations rate was taken up by solar photovoltaic, solar heat and geothermal heat. In addition, using the KRESS Program, economic, technical, environmental and complexity evaluations for the upper 5% was made, deducting the optimal ratio of the system. The results produced the following optimal combination ratios: solar photovoltaic (83.3%) in economic evaluation, solar heat (8.3%) and geothermal heat (75%) in technical evaluation, solar photovoltaic (83.3%) in environmental evaluation, and solar photovoltaic (83.3%, the same as in economic evaluation) in complexity evaluation.

The Preventing and Diagnosis of Ultra High Voltage Substation Devices and Combination with An Automation System of A Substation (초고압 변전기기의 예방진단 및 종합 자동화)

  • Yang, Hang-Jun;Kim, Kyung-Geun;Kim, Sung-Sik;You, Jeong-Sik;Kim, Hong-Suk;Lee, Hahk-Sung
    • Proceedings of the KIEE Conference
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    • 2001.05a
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    • pp.275-277
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    • 2001
  • In this paper a preventative and diagnostic system for high and ultra high voltage electric power transmission apparatus is proposed to secure substation normal operation. The proposed system consists of monitoring sub-system and diagnostic sub-system, which are mainly for GIS and main transformer, and the system will be applied for newly established 765kV class substation in Korea. Some guideline for combination with substation control system are presented, and engineering solution as an improved substation automation system is also proposed.

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Evaluation of Bond Strength in cp-Ti and Non-precious Metal-Ceramic System Using a Gold Bonding Agent (티타늄과 비귀금속 합금에 중간층으로 적용한 Au bonding agent의 금속-도재 결합에 대한 평가)

  • Lee, Jung-Hwan;Ahn, Jae-Seok
    • Journal of Technologic Dentistry
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    • v.31 no.4
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    • pp.15-23
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    • 2009
  • The aim of this study was to evaluate the bond strength of using a Au bonding agent applied on cp-Ti and nonprecious metal-gold-ceramic system. Metallic frameworks(diameter: 5mm, height: 20mm)(N=56, n=7per group) cast in Ni-Cr alloy, Co-Cr alloy and cp-Ti were obtained using acrylic templates and airborne particle abraded with $110{\mu}m$ aluminum oxide. Au bonding agent was applied on wash opaque firing as intermediate layer. SEM and SEM/EDS line profile were performed on the cutting the cross-section of the metal substrate-porcelain with intermediate Au coating. Groups were tested using shear bond strength(SBS) testing at 0.5mm/min. The mean SBS values for the ceramic-Au layer-metal combination were significantly higher than those ceramic-metal combination. While ceramic-Au layer-cp-Ti combinations failed to increase bond strength instead of using a titanium bonding porcelain. The appication of using Au intermediate layer significantly improve the bond strength combination with metal-ceramic system.

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Life Cycle Cost Analysis about Renewable Energy Facilities Combination of Photovoltaic system, Solar thermal system and Geothermal system (태양광발전, 태양열 급탕, 지열시스템의 신재생에너지설비 조합에 관한 LCC 분석)

  • Chun, Sang Hyun;Ahn, Jang-Won;Kim, Wonwoo;Cho, Seung-Yun
    • KIEAE Journal
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    • v.12 no.1
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    • pp.105-112
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    • 2012
  • When a building is planned and designed, the design should be able to minimize the cost during the whole life cycle of the building. This study has begun to analyze LCC about the alternative design which is applicable to renewable energy facility construction. It is reviewed domestic and foreign papers about the trend of LCC technology and it is determined the analytical method to analyze the LCC of renewable energy. Regarding the review of alternatives, it is chosen the three alternatives which are able to designed combing the renewable energy facilities and it is performed the LCC analysis about each alternative. Alternative 1 is Photovoltaic + Solar Thermal + Photovoltaic /Wind Power, Alternative 2 is Geothermal + Photovoltaic, and Alternative 3 is Photovoltaic + Solar Thermal. The LCC analysis is present value method, its analytical period is 40 years and it is applied 3.2% of real discount rate. As a result, it is proved that Alternative 1 and Alternative 3 are not able to collectible the early investment cost during the analytical period and Alternative 2 is analyzed that its pay-back period of early investment cost is about 31 years. As the final outcome of this study on case analysis, it is more advantageous to use the combination of Geothermal and Photovoltaic energy than to use the other combination in LCC aspect.

Photo Retrieval System using Combination of Smart Sensor and Visual Descriptor (스마트 센서와 시각적 기술자를 결합한 사진 검색 시스템)

  • Lee, Yong-Hwan;Kim, Heung-Jun
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.2
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    • pp.45-52
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    • 2014
  • This paper proposes an efficient photo retrieval system that automatically indexes for searching of relevant images, using a combination of geo-coded information, direction/location of image capture device and content-based visual features. A photo image is labeled with its GPS (Global Positioning System) coordinates and direction of the camera view at the moment of capture, and the label leads to generate a geo-spatial index with three core elements of latitude, longitude and viewing direction. Then, content-based visual features are extracted and combined with the geo-spatial information, for indexing and retrieving the photo images. For user's querying process, the proposed method adopts two steps as a progressive approach, filtering the relevant subset prior to use a content-based ranking function. To evaluate the performance of the proposed scheme, we assess the simulation performance in terms of average precision and F-score, using a natural photo collection. Comparing the proposed approach to retrieve using only visual features, an improvement of 20.8% was observed. The experimental results show that the proposed method exhibited a significant enhancement of around 7.2% in retrieval effectiveness, compared to previous work. These results reveal that a combination of context and content analysis is markedly more efficient and meaningful that using only visual feature for image search.

Error in Variable FIR Typed System Identification Using Combining Total Least Mean Squares Estimation with Least Mean Squares Estimation (입출력 변수에 부가 잡음이 있는 FIR형 시스템 인식을 위한 견실한 추정법에 관한 연구)

  • Lim, Jun-Seok
    • The Journal of the Acoustical Society of Korea
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    • v.29 no.2
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    • pp.97-101
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    • 2010
  • FIR type system identification with noisy input and output data can be solved by a total least squares (TLS) estimation. However, the performance of the TLS estimation is very sensitive to the ratio between the variances of the input and output noises. In this paper, we propose an iterative convex combination algorithm between TLS and least squares (LS). This combined algorithm shows robustness against the noise variance ratio. Consequently, the practical workability of the TLS method with noisy data has been significantly broadened.

Application Management System with ZeroMQ and Alarms in Distribution Management System (배전운영 시스템에서의 ZeroMQ와 알람 정보를 이용한 운영기능 관리 시스템)

  • Kim, Pil-Seok;Kang, Ho-Young;Lim, Il-Hyung;Park, Jong-Ho;Shin, Yong-Hak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.8
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    • pp.1161-1167
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    • 2015
  • Distribution Management System(DMS) ienhancing distribution automation system-based operation efficiency is an optimized system by various operational applications in a distribution network. DMS employs various applications like topology reconfiguration, volt/var control, and restoration at events such as overload, voltage violation, and a fault in a distribution system. An operation efficiency to employ multi-applications as restoration with short-term load forecasting is higher than a performance by a single application; and the applications are accomplished by an operator’s control. Applications’ combination is determined by various alarm information which means critical issues in order to operate a distribution system. Thus, this paper proposes an application management system which can configure application combination, control applications depending on alarm information and check their performance condition. The proposed application management system can be customized by operator easily and have high operation efficiency and reliability because it is worked by reviewed alarm information from operator.

Modular System Expressed in Structural System of Fashion Since the Late of 20C -Focusing on the Fashion of Yeohlee Teng, John Ribbe, and Galya Rosenfeld- (20세기후반 이후 패션 구성 방식에 나타난 모듈러 시스템 -욜리 탱, 존 리베, 갈야 로젠펠드 작품을 중심으로-)

  • Yang, Hee-Young
    • Journal of the Korean Society of Clothing and Textiles
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    • v.32 no.5
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    • pp.788-799
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    • 2008
  • Since the late 20C, a lot of fashion designers have considered about new construction system in fashion. Many arguments about architectural form and construction system have being supported on enlargement of range of functionalism fashion through the consideration about new shape and combination among various any other spheres. Modular concept, which is able to divide complex construction of integration into separated basic unit and use various and liberal arrangements, is regarded alternative idea of economic construction that creates new shape and constructive beauty through the simple operation and changing combination continuously. Specially, fashion designs of Yoehlee Teng, John Ribber, and Galya Rosenfeld are estimated that they are effectively utilized architectural modular system pursuing multi-function and multi-change in fashion. Modular system utilized in fashion construction will be classified as follows: 1) layering system of Yoehlee Teng, 2) combine system of john Ribber, and 3) lego system of Galya Rosenfeld. This thesis will presents beneficial guide for simple and practical functionalism fashion design development in 21C.